<?php

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

require_once 'System.php';
var_dump(class_exists('System', false));

$a = 1;
$b = 2;
echo sumar($a,$b);

$a2 = 4;
$b2 = 0;
echo sumar($a2,$b2);

function sumar($a,$b) 
{
    return $a + $b;
}
?>
